Tandy's first hi-res board was for
the Model II computer(cat. no. 26-4104), which was quickly followed by the
Model III hi-res board (cat. no. 26-1125).Finally when the Model 4 was released a hi-res board was available (cat.
no. 26-1126).All these hi-res boards
were very expensive and sold in small numbers and had little software support
from Radio Shack.µLabs produced a compatible,
but less expensive Model 4 hi-res board called the Grafyx
Solution along with a catalogue of software.All these boards featured 640x240 (153,600 pixels) resolution and
special BASIC language upgrade which included commands like LINE, CIRCLE, PAINT,
and VIEWPORT.

By the mid-1980s a reasonable number
of interesting and sophisticated software packages had been released for the
Model III/4 hi-res boards.This page
aims to have these software packages available for download, and a place to buy
the necessary hardware - some in kit form, some fully assembled - to upgrade
your Model III, 4, 4P or 4D for hi-res graphics.

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HARDWARE:

Model 4/4GA/4P/4D
"Improved Grafyx 4.2(.1)" HRG board!

(Released
3rd April, 2015)

- COMPLETLY ASSMEBLED AND TESTED! JUST PLUGS
IN NO SOLDERING REQUIRED! -

This is my new hi-res graphics (HRG) board based on the old
µLabs GX 4.2 board which has been unavailable since the late 1980s.This one utilises an updated design with
fewer chips, smaller footprint, while still having a 25% performance increase
over Tandy's HRG and compatible with all software for both the GX 4.2, 5.1, and
Tandy's HRG.

This great device works in all Model 4s and 4Ps and : the
original non-gate array M4 and 4P, the gate-array M4 and 4P, and the 4D. For a
video of this HRG in action, click HERE.

Only
$USD165.00!

($A215.00)

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HARDWARE:

Cable Kit for Model
II/12/16/16B/6000 HRG

(Released
1st June, 2015)

- COMPLETLY ASSMEBLED AND TESTED! -

If in 2014 or 2015 you bought one of the HRG boards on eBay
sold by rpsi92 in the USA, you quickly found that it lacked the pair of special
cables required to hook the board up to your system.They are made from a combination of New and
NOS (hard to find) parts and work perfectly.

For a video of how to set up these cables and your HRG board,
click HERE.

Only
$USD69.00!

($A95.00)

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OPERATING SYSTEMS:

(Added 19th March, 2015)

Download the following
operating systems to get started using your hi-res board:

MagicDraw requires a 128K Model 4 or 4P with LS-DOS 6.3.1, a 3-button serial mouse
and relevant adapters to connect to the Model 4 or 4P serial port.If your early Model 4 non-gate array has no
serial board then you need to add one as well.

The classic Sinclair ZX Spectrum game
now for the TRS-80 Model 4.The port has
been done by TCDev'sRetro Ports.Nice work Mark.Two versions of the game (one in 256x192 and
the other 512x192) are in the download and it works on both standard and
Improved Grafyx Solution HRGs.